Investigation of three radiation detectors for accurate measurement of absorbed dose in nonstandard fields

Medical Physics
Eunah ChungJan Seuntjens

Abstract

To establish accurate experimental dosimetry techniques for reference dose measurements in nonstandard composite fields. A cylindrical PMMA phantom filled with water was constructed, at the center of which reference absorbed dose to water for a head and neck IMRT delivery was measured. Based on the proposed new formalism for reference dosimetry of nonstandard fields [Alfonso et al., Med. Phys. 35, 5179-5186 (2008)], a candidate plan-class specific reference (pcsr) field for a typical head and neck IMRT delivery was created on the CT images of the phantom. The absorbed dose to water in the pcsr field normalized to that in a reference 10 x 10 cm2 field was measured using three radiation detectors: Gafchromic EBT films, a diamond detector, and a guarded liquid-filled ionization chamber developed in-house (GLIC-03). Pcsr correction factors [formula in text] were determined for five different types of air-filled ionization chambers (Exradin A12, NE-2571, Exradin A1SL, Exradin A14, and PinPoint 31006) in a fully rotated delivery and in a delivery with the same MLC settings and weights but from a single gantry angle (a collapsed delivery). The combined standard uncertainty in measuring the correction factor [formula in text] using the...Continue Reading

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Citations

Jan 10, 2012·Medical Physics·Eunah ChungJan Seuntjens
Nov 4, 2011·Medical Physics·Saad AldelaijanSlobodan Devic
Mar 3, 2012·Medical Physics·Hugo BouchardHugo Palmans
Oct 4, 2011·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·Michele ZeverinoGianni Taccini
Jan 31, 2017·Medical Physics·Michele ZeverinoRaphaël Moeckli
Nov 15, 2012·Journal of Applied Clinical Medical Physics·Frédéric GirardFrédéric Lacroix
Jun 21, 2012·Technology in Cancer Research & Treatment·Maria F ChanChandra Burman
Mar 27, 2018·Medical Physics·Neda Gholizadeh SendaniParham Alaei
Nov 19, 2018·Medical Physics·Vimal K DesaiWesley S Culberson
Jul 30, 2020·Physics in Medicine and Biology·Nolan EsplenMagdalena Bazalova-Carter
Jan 14, 2021·Physics in Medicine and Biology·Hugo Bouchard
Feb 2, 2021·Medical Physics·Hugo BouchardSimon Duane

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